Patent No. 602820 Disclosed is a method of selecting a lipid-containing formulation for administration to a subject, comprising: a) evaluating the subject on the basis of one or more factors selected from: age of the subject, sex of the subject, diet of the subject, the body weight of the subject, physical activity level of the subject, lipid tolerance of the subject, medical conditions of the subject, family medical history of the subject, and ambient temperature range of the subject’s living area, and b) combining daily amounts of fatty acids comprising omega-6 and omega-3 fatty acids, wherein the ratio of omega-6 to omega-3 fatty acids and/or their amounts are controlled based on the one or more factors; wherein the formulation provides a dosage of omega-6 and omega-3 at an omega-6 to omega-3 ratio of 4:1 or greater; and/or the formulation provides a dosage of omega-6 and omega-3 at an omega-6 to omega-3 ratio of 1:1 to 10:1 if the subject has a diet of low antioxidants and/or low phytochemicals; and/or the formulation provides a dosage of omega-6 and omega-3 at an omega-6 to omega-3 ratio of 4:1 to 45:1 if the subject has a diet of high antioxidants and/or high phytochemicals; or the formulation provides a dosage of omega-6 and omega-3 at an omega-6 to omega-3 ratio of 2:1 to 30:1 if the subject has a diet of high seafood; and/or the formulation provides a dosage of omega-6 and omega-3 at an omega-6 to omega-3 ratio of 1:1 to 45:1 based on lipid tolerance of the subject; and/or the formulation provides a dosage of omega-6 and omega-3 at an omega-6 to omega-3 ratio of 1:1 to 50:1 if the subject has a condition wherein gradual increase of omega-6 and/or gradual withdrawal of omega-3 is necessary.